1
Ladder Mate
Use the two rooks to deliver checkmate, alternating ranks.
★★
2
Ladder Mate from the Centre
Two rooks deliver mate on their own, with no help from the king at all. It is the most mechanical mate there is.
★
3
Two Rooks Apart
The same two rooks, but in opposite corners of the board. Setting up the ladder takes one preparatory move.
★★